The NCP1651 is an active, power factor correction controller that can operate over a wide range of input voltages. It is designed for 50/60 Hz power systems. It is a fixed frequency controller that can operate in continuous or discontinuous conduction modes.
The NCP1651 provides a low cost, low component count solution for isolated ac- dc converters with mid- high output voltage requirements. The NCP1651 eases the task of meeting the IEC1000-3-2 harmonic requirements for converters in the range of 50W - 250 W.

FEATUREs
•Fixed Frequency Operation
•Average Current Mode PWM
•Internal High Voltage Start-Up Circuit
•Continuous or Discontinuous Mode Operation
•High Accuracy Multiplier
•Overtemperature Shutdown
•External Shutdown
•Undervoltage Lockout
•Low Cost/Parts Count Solution
•Ramp Compensation Does Not Affect Oscillator Accuracy

Typical Applications
•High Current Battery Chargers
•Front Ends for Distributed Power Systems